APPARATUS FOR MAKING HOLLOW PLASTIC ARTICLES

摘要

Selected portions of tubular thermoplastic parisons are heated from inside prior to introduction into the cavity of a blow molding unit. Steam which heats the parisons from inside is discharged by orifices provided in a hollow mandrel which is connected to a source of steam and extends with clearance through a hollow rotary shaft cooperating with a clamping device for parisons. The mandrel can be mounted for reciprocatory and/or rotary movement with reference to the shaft.